Blowpipe



-wardly beveled, as shown at 4. 4side ofthe lower end ofthe head is also Patented Mar. 2, 1926.

Joeri ,Hansis or CLEVELAND, @H10- Brown-ren.

Application filed February 1, 1323. Serial-No. 616,285.

To all 207mm t may concern.'

Be it lnown that I, JOHN `HARRIS, a citizen of the United States, residing at Cleveland, in the ,county .of Cuyahoga vand State of Ohio, have invented ka certain new and useful Improvement in Blowpipes, O which the following 4is a full, clear, ,and exact description, reference being had to the `accompanying drawings.V g Y This invention relates toblow pipes, `and has :Ecrits 'general object to improve the construction of the tips ,and .the manner kof securing the same to their respective gblowpipe heads. Further and more detailed objects of the invention will 4be set forth in connection with `the description of .the embodiment of my invention illustrated in the drawings hereof, whereinF l .repre sents" a central sectional view through a blowpipe having my invention applied thereto; Figj-Qan elevation, and Fig. 3 `a central sectional view, of the :tip employed in such pipe; .and Figs. d and 5 are sectional details corresponding respectively 'to the lines 4-4 and 5-`-5 of Fig. l. p

`Describing the various parts by reference characters, l denotes generally `the Vhead of a Lblowpipe, said head having an enlarged bore extending downwardly to the lower .end 4of the head from an `annular shoulder 2. The lower portion of' this :bore is threaded, as indicated 4at 3, and the veXtreme lower cnd is unthreaded and outwardly and down- The outthreaded, as indicated at 5.l

From `the shoulder 2, a bore or passage extends upwardlyand communicates with a chamber 7 to which cutting oxygen is `suppliedfby a branched passageway 8 and a tube 9. l0 denptes an inclined bore `the Upper portion of which is threzn'ledJ for lthe `reception of an injector ll,V the ilowei .end

ofthe bore being contracted, as .shown at 10a, and discharging into the chamber l2 provided in the upperlportion of the bore f3, The-'injector ll is provided with altransnverse i portion 13 communicating Vwith ka passageway lll to which preheatingvoxygen `lis suppliedobyuel 4tube 15,*)thellpdrtll-cpmfinunicatingmvitlr ia i central gexltend'ingftolthenozzl" en' ofthe injector:

passageway 13a oiiiniunicatingffwith he? chamber fait With Lthe ,exception ,of cent-ain details which cooperate with the tip (now to ,be described) the foregoing parts are such as are employed in ya standard type of blowr- 4pipe designated and put intoextensi-ve use by myself.

, The tip comp-rises .generally an `outer :njieinber 18I andan yinner `member 19, ,also .of ithesaine general type as employed ,by ine in theaforesaid standard blow-pipes, i,brit

)with differenceswhich will be pointed y,out `as thefdescription proceeds.

rllhe outer member has `a cylindrical upper portion and a tapered lower `end portion 18a- `Instead Aof being plain (as heretofore) .the upper end is threaded, `-as Yshown at 18, to enable l.the tip as .a 4whole 4to be s crewged into the threaded lowei1 end 3 ofthe head bore.

The inner .tip ineinber is provided with a .long ,cylindrical upper ,portion 19 and ,a .short -cylindrical portion 19h adapted to fit closely .within the cylindrical portion of the .outer member; also ,a tapered ,or frustoconical lower end portion l9e-adapted to fit closely v.within #the tapered lower end yof `the 4outer member. and 19h, the inner member is provided with opposed recesses 19d, and the outer member is secured to the inner memberby pressing corresponding portions 18" lthereofinto said recesses, `as .set forth and claimed in my application No. 615,189, filed January 237, 1923.

The upper end ,of the part 1l9llofthe inner tip member .preferably projects above `the `.Between the parts 119W upper end ofl the outer mem-ber, andthe parts 1.9?, f19b and the intermediate recessed portion lare provided with externalv slots providing ,passages .20 within the` outer member for-conducting-.tlie preheating mix- .ture from `thechainber l2 to ,the annular lOl) f as shown atll, and is provided at itsnppei i end with a `head '23 having a 'frusto-conical :upper end Qxadaptedtto seatiag'ainstthe i menibeimis; screwed lhvdmeii in hef'i'liead-I "'llheifpassa:'f

25 denotes an Vupwardly and inwardlyengaging parts tapered packing ring preferably of copper) slidably fitted upon the outer tip member and adapted to be forced into the tapered recess 4f and to be gripped against the said outer member by means of a gland nut 26 threaded on the lower end of the head and having an inwardlyv directed annular' shoulder 27 surrounding the outer tip member. y A y' I-Ieretofore, I have connected tips and blowpipe heads of the type described herein by slipping the outer member into the lower end of the head kand providing the upper' end of the inner member with a threaded head having a rounded upper end and the blowpipe head with a correspondinglyshaped threaded chamber below a bore corresponding in position to the bore or passage 6 herein. It has been found diiiicult to obtain a proper seat for such' rounded upper end of the tip head. rlhe threads employed for connecting the tip to the blowpipe head were 27 to the inch, because a coarser thread would reduce the size of the rounded head too much, with a corresponding reduction inthe size of the centra-l bore or passage 24. This small size of thread made it diiiicult to cut the same accurately, and a slight variation or irregularity in the thread-cutting on the tip head or on the cup or recess therefor would result in a leakage past the tip head. The present construction `enables the use of a coarse thread on the parts 3 and 18c (because of their size); and the head 23 may be provided with a straight taper (or frusto-coni cal surface) for the part 28, enabling it to take a line seat against the inner edge of the shoulder 2, the seat being of the needlevalve type. The accuracy of threading and the manner of seating the head 28 insuresa leak-proof joint between the parts 2 and 23a.

Should there be any slight eccentricity of the inner tip member and the seat formed by the shoulder 2 (due to inaccuracy in machining the parts) the length of the part of said member which projects above the part 18 of the outer member will enable the head 23 to adjust and centerlitself with respect -to its seat on the inner edge of said shoulder and thus provide a tight seat.

The recessing of the lower inner end of the blowpipe head, as indicated at Ll, allows the. copper cone 4 to be moved along the outer member into said recess and, when the nut 26 is tightened, the tip as a whole is held rmly, and leak-.proof connections are aiforded, at two places, namely; where the tapered end 23L engages the shoulder seat, and where the cone ring 25 engages the bottom of the head (in the recess 4L). The conering connection adapts itself for variations that may exist in the distance between the seats at 2 and 3, as one ofthe two seat- (the cone ring) is adjustable.

In my prior construction, it was necessary to use brass for the inner tip member because of the necessity for threading the small head, corresponding to the head 3 herein, and to use line threads thereon (for reasons hereinbefore set forth). By virtue of the construction herein, I am' enabled to use copper for both members of the tip. However,v if brass be used for the inner member, its coeliicient of expansion will cause the inner tip member to lengthen with respect to the outer member and the head and thus will insure a tight seat and a gastight closure between the parts 23a and 2.

Having thus described my invention, what I claim is:

l. In a blowpipe, the combinationof a head having a passage for cutting oxygen and provided with an annularseat below such passage and a chamber below such seat, the lower end of the chamber being threaded and the lower end of the headl surrounding such chamber being also threaded, a tip comprising an inner and an outer member, the outer member having a downwardly tapering bore at its lower end extending tothe .delivery end of the tip and the inner member having a downwardly tapering lower end fitting such tapered bore of the outer member, there being one or more passages for preheating mixture provided between such members and extending downwardly from the top of the outer member. to the lower end of the tip, the inner member eX- tending beyond and above the outer member and havingv a central passage for cutting oxygen and provided with a head having a tapered end adapted to engage the inner edge of said seat, the outer tip member being threaded into the lower end of said chamber, a gland nut threaded onto the lower end of the head and having an inwardly directed shoulder surrounding the outer tip member, and a packing ring on said shoulder engaging the joint between the outer tip member and the lower end of the head. l

2. In a blowpipe, the combination of a head having a passage for cutting oxygen and provided with anannular seat below such passage and a chamber below such seat, the lower end of the chamber being threaded, a tip comprising an outer member, and an inner member carried by the outer member, the outer member having its upper end threaded into the lower end of said chamber, there being one or more passages for preheating mixture extending downwardly to the lower end of the tip, the inner member being provided with a central passage for cutting oxygen and eX- tending beyond and above the outer member and provided with a head having atapered surface adapted to engage tbe inner edge only of said seat, and means for packing the joint between the bottom of the eliamber and the outer wall of tlie outer tip member.

3. In a blowpipe7 the combination of a head liar/*ing a passage for cutting oxygen and provided with an annular Seat below sueli passage and a chamber below suoli seat,` the lower end of the chamber being threaded, a tip comprising an outer member and an innermember carried by the outer member and extendingl substantially to the lower end of said enter member, the said tip having one or more passages for preheatingmixture provided between such members and ext-ending downwardly from the top of the outer member to the lower end of the tip, the inner member being provided with a central passage for Cutting` oxygen and extending beyond and above the outer member and provided with a tapered end portion adapted to engage the inner edge only of said seat, the top ot ,the outer tip member being threaded into the lower end of said chamber.

ln testimony wherfeot l hereunto a'lix my signature. l

JOI-IN HARRIS. 

